Heat map of residents’ ratings of their state’s contributions to U.S. history. Darker colors and higher percentages represent a larger estimated contribution to U.S. history. Map courtesy of Psychological Science.

Heat map of the mean Narcissistic Index for each state. The Narcissistic Index was calculated by subtracting the nonresident ratings for each state from the resident ratings. Warmer colors and higher percentages represent a larger Narcissistic Index, indicating that residents believed that their state contributed more to U.S. history than did nonresidents. Map courtesy of Psychological Science.